Fluid pump



Feb. 19, 1957 c. w, JOHNSON ETAL 2,781,729

FLUID PUMP Filed Dec. 22, 1955 4 Sheets-Sheet l 5 T /0 F/ G. l

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- ATTORNEYS Feb. 19, 1957 c. w. JOHNSON ETAL 2,781,729

FLUID PUMP Filed Dec. 22. 1955 4 sheets-sheet 2 INVENTORS 'Cf/ESTEZ 1MJOHNSON BY CZAEE/VCE z KEQGf/ Feb. 19, 1957 c. w. JOHNSON ETAL 2,781,729

7 I FLUID PUMP Filed Dec. 22, 1955 4 Sheets-Sheet s mmvrons 07 55752 14Jam/so CZABE/VCE fl KEOGH ATTORNEYS 19, 1957 c. w. JOHNSON E'I'AL2,731,729

FLUID PUMP Filed Dec. 22, 1955 4 Sheets-Sheet 4 75 IN VEN TORS I G. 9 v(f/6575B W. da/i/vsa/v BY CZAZE/VCE 7: X506 FLUID PUMP Chester W.Johnson, Butte, and Clarence T. Keogh, Whitehall, Mont.

Application December 22, 1955, Serial No. 554,760

6 Claims. (Cl. 103-120) The present invention relates to a fluid pumpand in particular to a double action and reversible fluid pump.

An object of the present invention is to provide a fluid pump which isreversible and double acting and one which may be used as a fluid motor.

Another object of the present invention is to provide a fluid pump ofthe rotor and vane type which has means for preventing wear on thevanes.

A further object of the present invention is to provide a fluid pumpwhich is sturdy in construction, one which can be used to pump twofluids at once without appreciable intermingling of the two fluids, andone which is economical to manufacture and assemble.

These and other objects and advantages of the present invention will befully apparent from the following description when taken in connectionwith the annexed drawings, in which:

Figure 1 is a sectional view of the fluid pump of the present inventiontaken on the line 11 of Figure 2,

Figure 2 is a sectional view of the assembly of Figure 1 taken on theline 22 of Figure 1,

Figure 3 is a sectional view taken on the line 33 of Figure 1,

Figure 4 is a sectional view taken on the line 4-4 of Figure 3,

Figure 5 is a sectional view, on an enlarged scale, taken on the line5-5 of Figure 1,

Figure 6 is a sectional view taken on the line 66 of Figure 5,

Figure 7 is an exploded view partially in section of the components ofthe assembly of Figure 1,

Figure 8 is a plan view of a modified form of the invention,

Figure 9 is a sectional view taken on the line 9-9 of Figure 8,

Figure 10 is a sectional view taken on the line 1010 of Figure 8, and

Figure 11 is a view taken on the line 11-11 of Figure 8.

Referring in greater detail to the drawings, in Figures 1 to 7,inclusive, a first form of the fluid pump of the present invention isshown and comprises a closed housing 10, circular in cross-section, withopposed abutments 11 and 12 on the inner surface of its wall. Arotatable shaft 13 extends through the rear wall of the housing and hasan end portion 14 axially disposed within the housing 10. A rotor 15,having a circular recess in one end thereof so as to be hollow, ispositioned within the housing 10 so that its recessed end faces thefront wall of the housing 10. The rotor 15 has its other end circumposedabout the shaft end portion 14 and connected to the latter for rotationtherewith. The rotor 15 in its rotational travel successively wipinglycontacts the housing abutments 11 and 12.

The rotor 15 is provided with a plurality of slots 16 extending inradial spaced relation therearound. A circular plate 17 covers the endsof the slots 16 at the end of the rotor opposite to the shaft 13 and issecured to the rotor by means of flat-headed bolts 18. The rear-wall fnited States Patent 0 of the housing designated by the reference numeral19 supports and is formed integrally with a bearing sleeve 20 whichsurrounds a bearing 21. The shaft 13 extends through the bearing 21. Anut 22 and an oil seal 23 surrounds the adjacent port-ion of the shaft13 and is secured to the end of the bearing sleeve 20 remote from therear wall 19. Another oil seal 24 is positioned on the portion of theshaft between the bearing 21 and the adjacent portion of the rotor 15.

The front wall of the housing is designated by the reference numeral 25and is formed integrally with and supports a bearing boss 26 which isarranged eccentrically with respect to the shaft end portion 14. Asleeve bearing 27 surrounds the bearing boss 26. A sleeve 28 is mountedupon the sleeve bearing 27 for rotation about the bearing boss 26 as anaxis. Another bearing boss 29 is formed integrally with and supported bythe bearing boss 26 on the end of the latter remote from the front wall25. Another sleeve bearing 30 surrounds and is carried by the bearingboss 29. Another sleeve 31 is supported upon the sleeve bearing 30 forrotation about the bearing boss 29 as an axis. The bearing boss 29 isarranged eccentrically with respect to the shaft end portion 14 and alsoeccentrically with respect to the bearing boss 26.

A plurality of vanes, in two sets, 32 and 33, project from the sleeves28 and 31, respectively, and have their inner ends connected to thesleeves 28 and 31 for limited swinging movement. The means connectingthe vanes of the sets 32 and 33 to the sleeves 28 and 31 is shown indetail in Figures 5 and 6 and comprises a plurality of slotted circularposts 34 slidably mounted on the upturned rim of each of the sleeves 28and 31. The inner end of each vane 35 of the sets of vanes 32 and 33 isformed with a socket portion 36 receiving one of the posts 34. The vanes35 project in radial relation about the sleeves 28 and 31 and each vaneis slidable in one of the slots 16 in the rotor 15 for movement from theposition in which the outer end of the vane is flush with the outersurface of the rotor to a position in which the portion of the vaneadjacent that end extends from the slot in the rotor. The vanes 35 arearranged so that the vanes of the set 32 which is associated with thesleeve 31 are each intermediate the adjacent vanes 35 of the other set33 which is associated with the sleeve 28.

The housing 10 is provided with an inlet 37 and an outlet 33 arranged inspaced relation in the portion of the wall of the housing on each sideof and between the abutments 11 and 12. The part of the housing wallbetween the adjacent inlet 37 and the outlet 38 and the adjacent portionof the rotor 15 defines a pump chamber. The vanes 35 of the set 32associated with the sleeve 28 successively project into and close thepump chamber designated by the reference numeral 39 on the right side ofFigure 1 and the vanes 35 of the set 33 associated with the sleeve 31successively project into and close the pump chamber 40 on the left sideof that figure upon execution of rotational travel of the rotor 15.

Referring to Figures 8 to 11, inclusive, a second form of the fluid pumpof the present invention is shown in which means is provided forshifting the bearing bosses relative to the shaft end portion and theassociated sections of the walls of the housing so as to effect theoutput of the pump. If the device is used as a motor, such shifting ofthe bearing bosses and the associated sections of the walls of thehousing acts as a speed control for the rotor. In this form of the pumpof the present invention, the closed housing 41 has a front wall 42 anda rear wall 43. A rotatable shaft 44 has an end portion 45 axiallydisposed within the housing 41 and is journaled in a bearing 46 which issupported in the housing rear wall 43. A hollow rotor 47 is circumposedabout the shaft end portion 45 and is connected to the shaft end portionby means of the key 48, shown in dotted lines in Figure 9, and a nut 49,for rotation with the shaft end portion, the part of the shaft endportion 45 inwardly of the end thereof being provided with threads forsecuring the nut 49. e

The housing 41 has opposed fixed main wall sections and 51 andsubsidiary wall sections 52 and 53 extending between and closing thespaces between the main wall sections 50 and 51. An abutment 54 isprovided on the inner surface of the main wall section 50 intermediatethe ends thereof and another abutment 55 is provided on the innersurface of the main wall section 51 intermediate the ends of the latter,the abutments 54 and 55 being shown in dotted lines in Figure 8. Therotor 47 in its rotational travel wipingly contacts the abutment 54 and55. The rotor 47 has a plurality of slots 56 arranged in radial spacedrelation thercalong, two of them being shown in dotted lines in Figure8. A first hollow bearing boss 57 is arranged eccentrically with respectto the shaft end portion 45 and projects into the rotor 47 and isconnected to the housing 41 for movement toward and away from the innerperiphery of the rotor 47 in a rectilinear path. The means connectingthe hearing boss 57 to the housing 41 consists in a web 58 extendingacross the bearing boss 57, as shown in dotted lines in Figure 8, theweb being connected to or formed integrally with one end of a firstslide bar 59 disposed in one end portion of a slot 60 which extendsdiametrically across the front wall 42 of the housing 41. A first sleeve61 and similar to the sleeve 28 of the first form of the invention shownin Figures 1 to 7, inclusive, is rotatable about the first bearing boss57 as an axis.

A second bearing boss 62 is arranged eccentrically with respect to thefirst bearing boss 57 and the shaft end portion 45 and projects into therotor 47 and is connected to the housing 41 for movement toward and awayfrom the inner periphery of the rotor 47. The means con meeting thebearing boss 62 to the housing 41 consists in a post 63 projecting fromthe adjacent end of another slide bar 64 also mounted in the slot 60inwardly of the other end of the latter for sliding movement andcarrying the second bearing boss 62 for movement toward and away fromthe inner periphery of the rotor 47 in a rectilinear path. A secondsleeve 65 is rotatable about the second bearing boss 62 as an axis.

A plurality of vanes 66 are arranged so that they project in radialrelation about the first sleeve 61 and the second sleeve 65 and each isslidable in one of the slots 56 in the rotor 47. The vanes 66 areidentical with the vanes 35 shown in the first form of the invention inFigures 1 to 7, inclusive, and one of them is shown in dotted lines inFigure 8. The same means which connects the vanes 35 to the associatedsleeve 28 and 31 in the form of the invention shown in Figures 1 to 7,inclusive, connects each of the vanes 66 to the associated sleeves 61and 65. The vanes 66 are likewise arranged in the same manner as thevanes 35 of the first embodiment of the present invention so that one ofthe vanes associated with the sleeve 61 is intermediate the adjacentvanes of the other sleeves 65.

The slide bar 59 connects the subsidiary wall section 52 to the bearingboss 57 for movement from the position closing the space between theadjacent ends of the main wall sections 50 and 51 to a position towardthe rotor 47 responsive to the execution of the movement of the firstbearing boss 57 away from the inner periphery of the rotor 47. The otherslide bar 64 connects the other of the subsidiary wall sections 53 tothe post 63 and to the bearing boss 62 for movement from the positionclosing the space between the other adjacent ends of the main wallsections 50 and 51 to a position toward the rotor 47 responsive to theexecution of the movement of the bear ing boss 62 away from the innerperiphery of the rotor 47.

An inlet 67 and an outlet 68 are provided in a portion of the main wallsections 50 and 51 adjacent each of the subsidiary wall sections 52 and53, as shown in dotted lines in Figure 8. Each of the subsidiary wallsections 52 and 53 and the parts of the main wall sections 50 and 51 onthe sides of the inlets 67 and the outlets 68 and ad jacent thereto andthe adjacent rotor 47 defines a pump chamber. The pump chamber on theright-hand side of Figure 8 is designated by the numeral 69 and the pumpchamber on the left-hand side of Figure 8 is designated by the referencenumeral 70. A bearing 71 surrounds the bearing boss 57 and supports thesleeve 61 for rotational movement therearound and another bearing 72surrounds the bearing boss 62 and supports the sleeve 65 for rotationtherearound. The vanes of the sleeve 61 successively extend into andclose the one pump chamber 69 and the vanes of the other sleeve 65extend into and successively close the pump chamber upon execution ofrotational travel of the rotor 47.

An actuating member, embodying a cam 73 slidably received within anelongated hole 74 in each of the subsidiary wall sections 52 and 53,operatively connects the hearing bosses 57 and 62 together forsimultaneous movement, each of the earns 73 being mounted upon one endof an arm 75. The other end of each of the arms '75 is connectedtogether by an actuating bar 76 for rotation of the cams 73 in the samedirection upon reciprocating movement of the bar 76 to eifect themovement of the subsidiary wall sections 52 and 53 inwardly of thehousing toward the rotor 47 to reduce the dimension of the pump chambers69 and 70, respectively. It is an important feature of the presentinvention that the vanes 66 do not frictionally engage the inner surfaceof the subsidiary wall sections 52 and 53 when they enter the pumpchambers and substantially close the pump chambers. The connection ofthe bearing bosses 57 and 62 to the subsidiary wall sections 52 and 53,respectively, causes the bearing bosses 57 and 61 to move with the wallsections 52 and 53 so that the vanes 66 continue to enter the pumpchambers 69 and 70 without frictionally engaging the inner surface ofthe wall sections 52 and 53 in all positions of movement of thesubsidiary wall sections 52 and 53.

Plates 77 and 78 bridge the slots 60 in the front wall 42 of the housing41 and retain the slide bars 59 and 64, respectively, within the slot60. Bolts 79 secure the front I wall 42 to the housing 41.

In operation, in the first form of the invention shown in Figures 1 to7, inclusive, the inlets 37 are connected to a source of fluid and theoutlets 38 are connected to a placeof discharge of fluid. The shaft 13is connected to a source of rotative power and as the rotor 15 rotatesthe vanes 35 of the one set of vanes 32 extend into the pump chamber 39and drive the fluid received from the inlet 37 towards the adjacentoutlet 38. At the same time the vanes 35 of the set of vanes 33 extendinto and close the pump chamber 40 to drive the fluid from theassociated inlet 37 towards the outlet 38. The pivotal connection ofeach of the vanes 35 with its associated sleeve 28 or 31 permits thesliding movement of the vanes within their associated slots in the rotorwithout binding.

The operation of the fluid pump of the second form of the inventionshown in Figures 8 to 11, inclusive, is the same as that of the fluidpump shown in Figures 1 to 7, inclusive. Upon connection of the shaft 44to a source of rotative power and connection of the inlets 67 to asource of fluid and the outlets 68 to a place of discharge of the fluid,the vanes 66 associated with the sleeve 61 project into and close thepump chamber 69. The other vanes 66 which are associated with the secondsleeve 65 project into and close the pump chamber 70, driving the fluidreceived from the associated inlet 67 to the associated outlet 68. Uponreciprocatory movement of the bar 76 in either direction, the subsidiarywall sections 52 and 53 are moved inwardly of the housing 41 to reducethe size of the respective one of the pump chambers 69 and 70. Thebearing bosses57 and 62 are also moved away from the inner periphery'ofthe rotor 47 so that the vanes 66 extend a lesser distance from theslots in the rotor 47 but still enter and close the associated one ofthe pump chambers 69 and 70.

Each of the fluid pumps of the two embodiments here shown and describedmay be used as a fluid motor with their inlets connected to a source offluid under pressure. In the form of the invention shown in Figures 8 to11, in-

3. A'fluid pump comprising a closed housing having opposed abutments onthe inner surface of the wall thereof, a rotatable shaft having an endportion'axially disposed in said housing, "a hollow rotor circumposedclusive, the cross-sectional area of the pump chambers 69 and 70 may bechanged at will to either control the output of the pump when it is usedas a pump or to control the speed of the rotor when used as a motor withfluid from a constant pressure source acting as the driving agent.

The limited swinging movement of the vanes 35 with respect to thesleeves '23 and 31 and the limited swinging movement of the'van'es 66with respect to the sleeves 61 and 62 is necessary due to theeccentrically-disposed axes of the bearing bosses.

What is claimed isi 1. A fluid pump comprising a closed housing havingopposed abutments on the inner surface of the Wall thereof, a rotatableshaft having an end portion axially disposed in said housing, a hollowrotor circumposed about said shaft end portion and connected to thelatter for rotation therewith, 'said rotor in its rotational tr-avelsuccessively wipingly contacting said housing abutments, there being aplurality of slots in said rotor extending in radial spaced relationtherearou'nd, a first sleeve disposed within said rotor and rotatableabout an axis eccentrically disposed with respect to said shaft endportion, a second sleeve disposed within said rotor and rotatable aboutanother axis eccentrically disposed with respect to said first-namedaxis and said shaft end portion, a plurality of vane projectin'g inradial relation about each of said first and second sleeves and eachslidable in a slot of said rotor, the va'ne's being arranged so that oneof the vanes of one of said sleeves is intermediate adjacent vanes ofthe other of said sleeves, and an inlet and an outlet arranged in spacedrelation in the portion of 'the wall of said housing on each side of andbetween said abutments, the part of the housing wall between theadjacent inlet and outlet and the adjacent portion of said rotordefining a pump chamber, the vanes of the one sleeve successivelyextending into and closing one of said pump chambers and the vanes ofthe other sleeve successively extending into and closing the other ofthe pump chambers upon execution of the rotational travel of said rotor.

2. A fluid pump comprising a closed housing having opposed abutments onthe inner surface of the wall thereof, a rotatable shaft having an endportion axially disposed in said housing, a hollow rotor circumposedabout said shaft end portion and connected to the latter for rotationtherewith, said rotor in its rotational travel successively wipinglycontacting said housing abutments, there being a plurality of slots insaid rotor extending in radial spaced relation therearound, a firstsleeve disposed within said rotor and rotatable about an axiseccentrically disposed with respect to said shaft end portion, a secondsleeve disposed within said rotor and rotatable about another axiseccentrically disposed with respect to said first-named axis and saidshaft end portion, :a plurality of vanes projecting in radial relationabout each of said first and second sleeves and connected thereto forlimited swinging movement and each slidable in a slot of said rotor, thevanes being arranged so that one of the vanes of one of said sleeves isintermediate adjacent vanes of the other of said sleeves, and an inletand an outlet arranged in spaced relation in the portion of the wall ofsaid housing on each side of and between said abutments, the part of thehousing wall between the adjacent inlet and outlet and the adjacentportion of said rotor defining a pump chamber, the vanes of the onesleeve successively extending into and closing one of said pump chambersand the vanes of the other sleeve successively extending into andclosing the other of the pump chambers upon execution of the rotationaltravel of said rotor.

about said shaft end portion and connected to the latter for rotationtherewith, said rotor in its rotational travel successively wipinglycontacting said housing abutments, there being a plurality of slots insaid rotor extending in radial spaced relation therearound, a firstbearing boss arranged eccentrically with respect to said shaft endportion, a first sleeve disposed within said rotor and rotatably mountedupon said first bearing boss, a second bearing boss arrangedeccentrically with respect to said first bearing boss and said shaft endportion, a second sleeve disposed within said, rotor and rotatablymounted upon said second bearing boss, a plurality of vanes projectingin radial relation about each of said first and second sleeves and eachslidable in a slot of said rotor, the vanes being arranged so that oneof the vanes of one of said sleeves is intermediate adjacent vanes ofthe other of said sleeves, and an inlet and an outlet arranged in spacedrelation in the portion of the wall of said hous ing on each side of andbetween said abutments, the part of the housing wall between theadjacent inlet and outlet and the adjacent portion of said rotordefining a pump chamber, the vanes of the one sleeve successivelyextending into and closing one of said pump chambers and the vanes ofthe other sleeve successively extending into and closing the other ofthe pump chambers upon execution of the rotational travel of said rotor.

4. A fluid pump comprising a closed housing, a rotatable shaft having anend portion axially disposed in said housing, a hollow rotor circumposedabout said shaft end portion and connected to the latter forrotationtherewith, said housing having opposed fixed main wall sectionsand a subsidiary wall section extending between and closing thespace'between adjacent ends of each of said main wall sections, meansconnecting said subsidiary wall sections to said housing for movementfrom the positions closing the space between adjacent ends of said mainwall sections to positions toward said rotor, an abutment on the innersurface of the wall of each main wall ection intermediate its endsthereof, said rotor in its rotational travel successively wipinglycontacting said housing abutments, there being a plurality of slots insaid rotor extending in radial spaced relation therearound, a firstsleeve disposed within said rotor and rotatable about an axiseccentrically disposed with respect to said shaft end portion, a secondsleeve disposed within said rotor and rotatable about another axiseccentrically disposed with respect to said first-named axis and saidshaft end portion, a plurality of vanes projecting in radial relationabout each of said first and second sleeves and each slidable in a slotof said rotor, the vanes being arranged so that one of the vanes of oneof said sleeves is intermediate adjacent vanes of the other of saidsleeves, and an inlet and an outlet in the portions of the main wallsections adjacent each subsidiary wall section, each of said subsidiarywall sections and the part of the main wall sections on the sides ofsaid inlet and outlet adjacent thereto and the adjacent portion of saidrotor defining a pump chamber, the vanes of the one sleeve successivelyextending into and closing one of said pump chambers and the vanes ofthe other sleeve successively extending into and closing the other ofthe pump chambers upon execution of the rotational travel of said rotor.

5. A fluid pump comprising a closed housing, a rotatable shaft having anend portion axially disposed in said housing, a hollow rotor circumposedabout said shaft end portion and connected to the latter for rotationtherewith, said housing having opposed fixed main wall sections and asubsidiary wall section extending between and closing the space betweenadjacent ends of each of said main wall sections, means connecting saidsubsidiary wall sections to said housing for simultaneous movementtogether from the positions closing the space between adjacent ends ofsaid main wall sections to positions toward said rotor, an abutment onthe inner surface of the wall of each main wall section intermediate itsends thereof, said rot-or in its rotational travel successively wipinglycontacting said housing abutments, there being a plurality of slots insaid rotor extending in radial spaced relation therearound, a firstsleeve disposed within said rotor and rotatable about an axiseccentrically disposed with respect to said shaft end portion, a secondsleeve disposed within said rotor and rotatable about another axiseccentrically disposed with respect to said first-named axis and saidshaft end portion, a plurality of vanes projecting in radial relationabout each of said first and second sleeves and each slidable in a slotin said rotor, the vanes being arranged so that one of the vanes of oneof said sleeves is intermediate adjacent vanes of the other of saidsleeves, an inlet and an outlet in the portions of the main wallsections adjacent each subsidiary wall section, each of said subsidiarywall sections and the parts of said rn'ain wall sections on the sides ofsaid inlet and outlet adjacent thereto and the adjacent portion of saidrotor defining a pump chamber, the vanes of the one sleeve successivelyextending into and closing one of said pump chambers and the vanes ofthe other sleeve successively extending into and closing the other ofthe pump chambers upon execution of the rotational travel of said rotor,and an actuating member operatively connected to said subsidiary wallsections for effecting the movements of the latter.

6. A fluid pump comprising a closed housing, a rotatable shaft having anend portion axially disposed in said housing, a hollow rotorcircurnposed about said shaft end portion and connected to the latterfor rotation therewith, said housing having opposed fixed main wallsections and a subsidiary wall section extending between and closing thespace between said main Wall sections, an abutment on the inner surfaceof the wall of each main wall section intermediate its ends thereof,said rotor in its rotational travel successively wipingly contactingsaid abutments, there being a plurality of slots in said rotor extendingin radial spaced relation therearound,

a first bearing boss arranged eccentrically with respect to said shaftend portion and projecting into said rotor and connected to said housingfor movement toward and away from the inner periphery of said rotor in arectilinear path, a first sleeve rotatable about said first bearing bossas an axis, a second bearing boss arranged eccentrically with respect tosaid first bearing boss and said shaft end portion and projecting intosaid rotor and connected to said housing for movement toward and awayfrom the inner periphery of said rotor, a second sleeve rotatable aboutsaid second bearing boss as an axis, a plurality of vanes projecting inradial relation about each of said first and second sleeves and eachslidable in a slot of said rotor, the vanes being arranged so that oneof the vanes of one of said sleeves is intermediate adjacent vanes ofthe other of said sleeves, one of said subsidiary wall sections beingconnected to said first bearing boss for movement from the positionclosing the space between adjacent ends of said main wall sections to aposition toward said rotor responsive to the execution of the movementof said first bearing boss away from the inner periphery of said rotorand the other of said subsidiary wall sections being connected to saidsecond bearing boss for movement from the position closing the spacebetween the other adjacent ends of said main wall sections to a positiontoward said rotor responsive to the execution of the movement of saidsecond bearing boss away from the inner periphery of said rotor, aninlet and an outlet in the portions of the main wall sections adjacenteach subsidiary wall section, each of said subsidiary wall sections andthe parts of said main wall sections on the sides of said inlets andoutlets adjacent thereto and the adjacent portion of said rotor defininga pump chamber, the vanes of one sleeve successively extending into andclosing one of said pump chambers and the vanes of the other of saidsleeves successively extending into and closing the other of said pumpchambers upon execution of rotational travel of said rotor, and anactuating member operatively connected to said first and second bearingbosses for effecting their simultaneous movement together.

No references cited.

